National 5 Biology Problem Solving

National 5 Biology Problem Solving

By Kirsty Wong

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Name another variable that should have been kept constant.

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State 2 variables that should be kept constant for a valid conclusion to be made.

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The fields planted with V cotton were used as a control. Give a reason for using this control.

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The greenhouse containing tomato plants without predators was used as a control experiment. State the purpose of a control in this investigation.

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The results show that leaves from a horizontal stem are bigger than leaves from a vertical stem. Give a reason why these results might not be reliable.

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Explain why using 10 farms instead of 3 would have improved this investigation.

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Suggest one way in which the reliability of the results could be improved.

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To make the investigation valid, all leaves were taken from the same plant. Explain why this was necessary.

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State the conclusion.

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What conclusion can be drawn about catalase activity, using the results for carrots only?

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Describe the relationship between the distance from the seawater at low tide and the average number of lugworms per m2.

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Use data from the graph to describe the changes in blood glucose concentration over this 150 minute period.

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When is the rate of increase in antibody concentration the greatest?

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Complete the table by calculating the average width of the leaves from the vertical stem.

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Complete the table to show the average mass of one limpet.

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Calculate the average decrease per year for the abundance of ragwort over the five year period.

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Calculate the average rate of movement of liquid in the glass tubing (mm/minute)

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Complete the table by calculating the percentage change in mass for beaker A.

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Explain why the population decrease was expressed as a percentage rather than a decrease in number.

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Calculate the number of students with straight thumb to hitchhikers thumb as a simple whole number ratio.

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